I don't understand... Bankai is meant to be bigger than your Shikai, so dafuq's going on here? And since when does Bankai effect your skin?
Besides that, now that Zaraki just REKT Gerard, it's obvious he'll either parry him or even overwhelm him with Vollstandig. Which will lead to the reappearance of the Vizards who go Bankai and thus together they win.
2/5 because I've had enough of Zaraki